Arrangement for forcing away the pile core from the point of the pile



Oct. 13, 1931. i. ZEISSL. 1,827,552

v ARRANGEMENT FOR FORCING AWAY THE FILE CORE FROM THE POINT OF THE FILE Filed March 26, 1950 lNVe T'dk Patented Oct. 13, 1931 UNETED STATES PATENT OFFICE MODERNE GRUNDBAUTEGHNIK AUSTRIA B. H., OF VIENNA, AUSTRIA, A COMPANY OF ARRANGEMENT FOR FORCING AWAY THE IILE CORE FROM THE POINT OF THE FILE Application filed March 26, 1930, Serial No. 439,135, and in Germany February 10, 1930.

This invention relates to improvements in the arrangement for forcing away the pile core from the point of the pile.

It is already known to construct a pile in two separable parts, e. gfthe removable point of the pile and the pile core, whereby the latter is pressed away from the point of the pile by means of separate withdrawal or repulsion presses (for instance screw presses or hydraulic presses) which rest on the point of the pile, and subsequently can be readily withdrawn, particularly in the event of a cone-shaped pile core.

Bands are placed round the point of the pile during the operation of the repulsion press and take up the pulling force and pre Vent the penetration of the point of the pile. Further these steel bands prevent, during the withdrawal, the change of position of the sinking sleeves applied to the core.

If the presses for forcing away the pile core are arranged at the bottom end thereof they are accessible with diiiiculty only, they become soiled and chocked by sand and so forth and in case of breakdown cannot be repaired as long as the pile core remains in the ground. The pile core has to be pulled out by separate means, which are located above vthe ground, and even may have to be digged out.

A further drawback consists in that the steel hands can be secured to the point of the pile with diiflculty only, because. not sulficient space is at disposal for this object.

Further it is impossible to arrange removable the repulsion presses with repulsion Ways of different lengths, without changing the conical shape of the core.

These drawbacks are removed according to the present invention by arranging the re pulsion press at the top end of the pile core and transmitting the force, necessary for forcing away the pile core, from the top end of the pile to the point of the pile by means of a separate pressure transmission member (for instance pressure-rods or withdrawal tubing).

One mode of carrying out the present invention isillustrated by way of example on the accompanying sheet of drawings in which Figs. 1 and 2 show the core in longitudinal section and in plan View respectively.

The point 2 of the pile is loosely fitted to the bottom end of the hollow pile core 1 and provided with an annular recess, which is covered by a cone-shaped plate 3, fixed to the said point 2 by a screw 4 Or the like. A repulsion press is arranged at the top of the pile core and includes a cylinder 5 positioned within the pile core, while a piston 6 slides in said cylinder and is connected with the pile-point 2 by a tube 7 In this way the action of the piston is transmitted to the pilepoint by way of the tube 7. The piston projects laterally from the top end of the pressure transmitting tube 7, which passes through an inwardly projecting flange 12 of the pile core some distance below the cylinder 5. A supply pipe Sestablishes communica tion between the source of power and the cylinder 5. A cover 9, preferably screwed into the pile core, serves for the reception and transmission of the repulsion pressure to the pile core and also for facilitating the insertion and removal of the entire repulsion a1 rangement. The pile-point 2 is supported by bands 10, which engage the annular recess thereof, in order to prevent the further sinking into the soil of the pile-point 2 in view of the pressure applied thereto during the lift of the pile core 1, because this would render ineffective the action of withdrawal. The bottom ends of the bands 10, which are secured in place at the top end by a clamp 11, are covered by the cone-shaped plate 3 attached to the pile-point, so that they are protected against being damaged during the piledriving.

The arrangement operates in the following manner By operating the repulsion press, for in stance by forcing water through the supply pipe 8, the piston 6 forces the repulsion tube 7 onto the pile-point 2 and thus the bands 10 are subjected to pressure, whereby, owing to the arising reactive force, the pile core 1 is lifted with respect to the pile-point 2 and bands 10 and can be readily pulled out after a short way of repulsion in View of its cOnical shape. Thereby the pile-point together with the bands are taken along by the piston, 1

which is lifted after'a shorter or longer way of repulsion by the flange 12.

1. Pile comprising in combination a pile core, a removable pile-point attached thereto and provided with an annular recess therein, bands extending along the pile core, the bottom ends of said bands engaging said recess, and a repulsion press arranged at the top endof the pile core. 7

' 2. Pile comprising in combination a pile core, a removable pile-point attached thereto and provided with an annular recess therein, bands extending along the pile core, the bottom ends of said bands engaging said recess, a repulsion. press arranged at the top end of the pile core, and means arranged between and transmitting the repulsion pressure from said press to said pile-point.

3. A pile comprising in combination a firm tubular pile core, a pilegpoint removably attached thereto, an incompressible connecting means to which the point is fixed, said connecting means being provided with a lateral projection near its top end. a repulsion press attached to the topend of the pile core working on' the top end of the said connecting means to lift the pile core from the pilepoi-nt and an inwardly extending flangein the pile core to cooperate with the top end projection of the said connection means to remove or hoistthe pile-point together with the pile core. 7 I I 4. Apile comprising in combination a firm unyielding tubular pile core, a pile-point reinovably attached thereto, an incompressible connecting means, to which the pile-point is fixed, said connecting means being provided with a lateral projection near its top end, a

repulsion press attached to the top end of the pile core working onthe top endof thesaid tolift the pile core from 7 connecting means thepile-point and an inwardly extending flange in the pile core to cooperate with the 1 top end projection of the said connecting means to removeuor hoist the pile-point together'withthe pile core. 2

In testimony whereof I afliX my signature in p'resence of two witnesses IGNAZ ZEISSL. 

